Electrical thermostatic alarm.



' PATENTED NOV; 5, 1907. J. FINOH. ELECTRICAL THERMOSTATIG ALARM.

APPLICATION FILED FEB. 28. 1907.

Quucul'bz Jada l ]76fi l vihmaoao JODA FINCH, OF LYNDHURST, NEW JERSEY.

ELECTRICAL THERMDSTATIC ALARM.

Specification of Letters Patent.

Patented Nov. 5, 1907.

Application filed February 26, 1907- Ssrial No. 3591332.

To all whom it may concern:

Be it known that I, JODA FiNcn, a citizen of the United States, residing at Lyndhurst, in the county of Bergen and State of New Jersey, have invented new and useful Improvements in Electrical Thermostatic.

Alarms, of which the following is a specification.

This invention relates to thermostatic alarms of that type in which a suitable signal device is actuated by the closing of an electric circuit when a certain predetermined temperature is reached.

The invention has for one of its objects to improve and simplify the construction and operation of devices of this character so as to be comparatively easy and inexpensive to manufacture, thoroughly reliable and efficient in use, and conveniently adjusted to operate at any desired temperature.

A further object of the invention is the provision of a novel form of thermostatically actuated switch in connection with a metallic thermometer, the switch being adjustable so that the electric circuit may be closed automatically at any predetermined tempera ture.

' With these objects in view and others, as will appear as the description proceeds, the invention comprises the'various novel features of construction and arrangement of parts'which will be more fully described hereinafter, and set forth with particularity in the claims appended hereto.

In the accompanying drawing, which illustrates one embodiment of the invention, Figure 1 is a vertical section of the apparatus taken on line 11, Fig. 2.

V Fig. 2 is a horizontal section taken on line 2-2, Fig. '1.

supporting plate 4 is an approximately annular spring 6 that is adapted to expand and contract under the changes in temperature. This thermostatic element has attached to its free end, a yoke 7 which carries a cord or other flexible element 8 that laps around the shaft or arbor 3 so that as the yoke 7 is oscillated by the expansion and contraction of the spring 6, the arbor 3, and hence the hand 2, is moved back and forth.

The movement of the thermostatic element 6 is employed for closing an electric circuit in which is arranged a suitable alarm or signal device. The terminals 9 of the outside conductors of the signal circuit are connected to suitably insulated binding posts 10 arranged at diametrically opposite points on the casing 1,

and connected with these posts are internal flexible conductors 11 and 12. The conductor 11 is secured to the shank 13 of the yoke -7 and the extremity of the conductor is formed into a shoe 14. Arranged at one side of the yoke is a shaft 15 mounted in bearings 16 on the front and back walls of the casing. This shaft is provided with an eccentric 17 of metal arranged in line with the shoe or contact 14, so that as the shoe is moved with the. thermostatic element 6, an electrical connection will be made between the shoe and eccentric. The shaft 15 carries a collar 18 which is electrically connected with the eccentric through the shaft 15. One end of the conductor 12 is arranged in permanent contact with the collar, and the shaft 15 is freely adjustable without this contact being impaired. The conductors 10 and 11 are insulated except at their ends where they are connected with the posts 10, and where they contact with the eccentric 17 and collar 18. The shaft 15 has a knurled head 19 which may, with advantage, be formed of insulating material, and is located at the rear of the casing, whereby the shaft can be manually adjusted to change the position of the eccentric 17 for enabling the circuit to be closed at any desired temperature. Any suitable indicating means may be employed for determining-the proper adjustment of the shaft 15. As for instance, the shaft may be provided with a hand or index 20 that passes over a suitable dial 21 on the back of the casing.

From the foregoing description, taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily I apparent to those skilled in the art to which the invention appertains. The apparatus is of simple and durable construction, composed of few parts and so designed as to be readily adjusted for producing an alarm at any desired predetermined temperature.

I have described the principle of operation of the invention, together with the apparatus which I now consider to be the best embodiment thereof, but I desire to have it understood that the apparatus shown is merely illustrative and that various changes may be made when desired, as are within the scope of the claims.

Having thus described the invention, what I claim 1. in a device of the class described, the combination of a support, a thermostatic element mounted thereon, hinding posts on the support, flexible conductors connected with the posts, and one attached to the element, a shaft disposed at one side or the element for rotation, an adjustable member on the. shaft normally separated from the conductor attached to the element and adapted to contact therewith, and means connecting the other conductor with the shaft for completing the circuit there through, said means including a moving contact.

2. In a device or the class described, the combinationof a casing, an arbor therein, a temperature indicating hand thereon, a thermostatic element, a mechanism between the element and arbor for actuating the latter, conductors within the casing, means for connecting them with an external circuit, a shaft mounted in the casing and extending through one wall thereof, means for turning the shaft by hand, a permanent electrical connection between one conductor and the shaft, and an eccentric with which the other conductor is adapted to contact by the movement of the thermostatic element.

3. In a device of the class described, the combination of a support, a thermostatic element thereon. a conductor attached to the element and having one end formed into a shoe or contact, a second conductor, a rotary shaft on the support, a collar thereon with which the second conductor is in permanent contact, an eccentric arranged in line with the shoe or contact of the first conductor for 15 In testimony whereof, I aflix my signature in presence 20 of two witnesses.

.TODA FINCH.

Witnesses I-Im'rr C. HATCH, E. L. FXNCH. 

